CN112857078A - Dynamic hydraulic balance adjusting method and system for cooling tower group water system - Google Patents
Dynamic hydraulic balance adjusting method and system for cooling tower group water system Download PDFInfo
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- CN112857078A CN112857078A CN202110020078.XA CN202110020078A CN112857078A CN 112857078 A CN112857078 A CN 112857078A CN 202110020078 A CN202110020078 A CN 202110020078A CN 112857078 A CN112857078 A CN 112857078A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C1/00—Direct-contact trickle coolers, e.g. cooling towers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/003—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for cooling towers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention relates to the technical field of hydraulic balance adjustment of a centralized central air conditioner, in particular to a dynamic hydraulic balance adjustment method and a dynamic hydraulic balance adjustment system for a cooling tower group water system. The system can effectively improve the system energy efficiency and the equipment operation efficiency, and solves the problem of hydraulic balance among the water distribution branch pipes of each cooling tower in the cooling tower group in order to adapt to the dynamic change operation of the air conditioning system on the cooling side in the operation process of the existing air conditioning system.
Description
Technical Field
The invention relates to the technical field of hydraulic balance adjustment of a centralized central air conditioner, in particular to a dynamic hydraulic balance adjustment method and system for a cooling tower group water system.
Background
At present, with the pursuit of high-efficiency energy-saving operation of a central air-conditioning system, the maintenance of the high-efficiency operation of a cooling tower is more and more important in the energy-saving work of the air-conditioning system, so that the pursuit of scientificity, reasonability, convenience and economy of hydraulic balance adjustment of a cooling water supply system is stronger.
The air conditioning system is an adjusting system for guaranteeing the comfort of indoor environment temperature, humidity and the like, when in a cooling season, a cold source of the air conditioning system needs to provide cold energy for a room, and the cold energy produced by the cold source can change along with the actual indoor requirements, such as the time point of air conditioning use in the middle of a day, the actual cold supply time period in the cooling season, the adjustment of parameters of terminal air conditioning equipment, the starting and stopping of the terminal air conditioning equipment and the like. The cooling side of the air conditioning system is used for ensuring that the air conditioning system can normally and efficiently run, the air conditioning system transfers indoor heat to the cooling tower through chilled water, a refrigerant and cooling water, and finally discharges the indoor heat to the outside through heat exchange with air. Therefore, when the cold load of indoor demand or the cold quantity generated by the cold source changes, the heat quantity actually required to be transferred by the cooling side also changes in real time, in order to adapt to the change, the cooling side tries to correspondingly adjust the heat quantity in modes of running the number of cooling water pumps, the running frequency of the cooling water pumps, the running number of cooling towers, the running frequency of the cooling towers and the like, but often neglects the distribution condition of the cooling water at the water distribution disc of the cooling tower, the conditions of uneven water distribution of the cooling tower, water floating of the cooling tower and the like are possibly caused, the heat dissipation capacity and the efficiency of the cooling tower are seriously influenced, and further the purposes of improving the overall efficiency of the air conditioning system and saving energy are influenced.
In order to solve the problems, an electromechanical system is adjusted in the early stage of operation of many projects, hydraulic balance adjustment work under the design working condition is carried out on water distribution of a cooling tower, the requirement of design water balance can be met when the system operates under the rated working condition, but more than 80% of time is not operated under the rated working condition when an air conditioning system operates all the year round, multiple combinations of cooling side equipment (a cooling tower and a cooling water circulating pump) can be realized when the air conditioning system operates under the non-rated working condition, the manual adjustment mode is adopted, even if special manpower is invested, the dynamic requirement of real-time change of the hydraulic balance of the system can not be met all the time, and the labor cost required to be paid is huge and the effect is not obvious.
In addition, other technical personnel in the technical field apply for corresponding inventions, namely, real-time monitoring and adjustment are realized through a balance valve so as to achieve the aim of guaranteeing hydraulic balance, the method is relatively high in cost, the total resistance of a pipeline of a cooling water system is increased, the requirement on the lift of a cooling water circulating pump is higher, certain influence is brought to the overall energy saving of the system, and in the installation and implementation process, the engineering quantity and the reconstruction difficulty are higher no matter whether existing buildings or newly built buildings are adopted.
Disclosure of Invention
The invention aims to provide a dynamic hydraulic balance adjusting method and system for a cooling tower group water system, so as to effectively improve the system energy efficiency and the equipment operation efficiency and solve the problem of hydraulic balance among cooling tower water distribution branch pipes in a cooling tower group in the operation process of the existing air-conditioning system, wherein the cooling side of the existing air-conditioning system is adapted to the dynamic change operation of the air-conditioning system.
In order to solve the above technical problems, the present invention provides a dynamic hydraulic balance adjustment method and system for a cooling tower group, comprising the following steps,
Cooling tower operating conditions and operating frequency (f)1-1、f1-2、……f1-n、……、fm-1、fm-2、……、fm-nWherein m represents the total number of branch pipes of the cooling tower group, n represents the total number of branch pipes of the cooling water supply in each branch pipe, the operation state and the operation frequency of the cooling water circulation pump (f)1、f2、……、fNWhere N represents the total number of water pumps), and the pressure P of the cooling water main water supply pipe of the cooling tower groupGWater supply pressure (P) of cooling water branch pipe of cooling tower setG-1、PG-2、……PG-mWhere m represents the total number of cooling tower bank branches), the pressure of the water supply branch pipe (P) of each cooling tower1-1、P1-2、……、P1-n、……、Pm-1、Pm-2、……、Pm-nWherein m represents the total number of branch pipes of the cooling tower groupAnd n represents the total number of the cooling water supply branches in each branch pipe).
According to the running states and frequencies of the equipment such as the real-time cooling water circulating pump, the cooling tower and the like and the pressure P of the cooling water main water supply pipe of the cooling tower group collected in the step 1GAnd the cooling tower group cooling water branch pipe water supply pressure (P)G-1、PG-2、……、PG-mWhere m represents the total number of cooling tower group branches), the pressure of each cooling tower water supply branch pipe (P)1-1、P1-2、……、P1-n、……、Pm-1、Pm-2、……、Pm-nWherein m represents the total number of branch pipes of the cooling tower group, and n represents the total number of cooling water supply branch pipes in each branch pipe), and inquiring the opening data of the electric control valve corresponding to the data strip in the database.
According to the step 2, the corresponding opening data (V) of each electric control valve in the database under the condition that the parameters are matched are compared1-1、V1-2、……、V1-n、……、Vm-1、Vm-2、……、Vm-nWherein m represents the total number of branch pipes of the cooling tower group, and n represents the total number of branch pipes of the cooling water supply in each branch pipe).
And (4) driving the regulating valve to a corresponding position according to the opening value of the regulating valve found in the step (3).
After the regulating valve acts, the pressure of the pipeline changes, and at the moment, the pressure P of the main cooling water supply pipe of the cooling tower group is controlledGWater supply pressure (P) of cooling water branch pipe of cooling tower setG-1、PG-2、……、PG-mWhere m represents the total number of cooling tower bank branches), the pressure of the water supply branch pipe (P) of each cooling tower1-1、P1-2、……、P1-n、……、Pm-1、Pm-2、……、Pm-nWherein m represents a branch pipe of the cooling tower groupTotal number, n represents the total number of the cooling water supply branch pipes in each branch pipe), and the like.
Carrying out specific analysis on the pressure data collected in the step 5, and calculating the pressure P of the water supply main pipe of the cooling tower groupGDistributing water branch pressure P to each cooling towerm-nThe difference Δ P.
Obtaining the minimum delta P according to the (m x n) delta P (n represents the total number of the water distribution branch pipes corresponding to the cooling tower in use at the current state) calculated in the step 6minThen, the measured values are compared with (m × n-1) Δ P to calculate respective imbalance ratios P% (. DELTA.P-. DELTA.P)min)/△Pmin100%), when all-10% to P% are less than or equal to 10%, performing step 8, otherwise, performing step 9 (i.e. P% |)>At 10%).
And (2) storing data such as the current equipment running state, frequency, pipeline pressure, opening degree of an adjusting valve and the like into a state storage database, and starting the next cycle from the step 1 to ensure that the hydraulic balance requirement under dynamic change can be met in real time.
The calculation result of the step 7 is that the absolute values of the unbalance rates are all larger than 10% ", and the calculation result delta P in the step 6 is used as the basisminAnd judging the opening V of the regulating valve on the water distribution branch pipe of the cooling tower corresponding to the pressure differencem-nIf the valve opening is 100%, step 13 is performed, otherwise step 10 is performed.
According to the calculated delta P in step 6min，And opening the regulating valve corresponding to the corresponding cooling tower water distribution branch pipe to 100 percent of opening.
After step 10, collecting the pressure P of the cooling water main water supply pipe of the cooling tower group of the pipelineGCooling water branch pipe supply for cooling tower setWater pressure (P)G-1、PG-2、……、PG-mWhere m represents the total number of cooling tower bank branches), the pressure of the water supply branch pipe (P) of each cooling tower1-1、P1-2、……、P1-n、……、Pm-1、Pm-2、……、Pm-nWhere m represents the total number of cooling tower group branch pipes and n represents the total number of cooling water supply branch pipes in each branch pipe).
Calculating the difference delta P (namely P) between the pressure of the water distribution branch pipe of each cooling tower and the pressure of the water supply main pipe of the cooling tower group according to the data collected in the step 11GAnd Pm-nThe difference of (d).
Finding out the delta P according to the delta P calculated in step 6 or step 12minAnd based on the data, PID (proportion integration differentiation) adjustment is carried out on the electric control valves of the rest of the water distribution branch pipelines (the electric control valves corresponding to the cooling tower in use), and the opening value required to be adjusted of each control valve is calculated.
And (4) performing corresponding action of the electric regulating valve according to the opening of the electric regulating valve calculated in the step (13), entering a step (5) after the action is completed, entering the next circulation process until a preset unbalance rate is reached, and storing the state data at the moment into a state storage database.
After the judgment result in the step 3 is 'no matching item', the step is started, and the pressure P of the cooling tower group cooling water main water supply pipe of the pipeline is collectedGWater supply pressure (P) of cooling water branch pipe of cooling tower setG-1、PG-2、……、PG-mWhere m represents the total number of cooling tower bank branches), the pressure of the water supply branch pipe (P) of each cooling tower1-1、P1-2、……、P1-n、……、Pm-1、Pm-2、……、Pm-nWhere m denotes the total number of cooling tower group branch pipes and n denotes the total number of cooling water supply branch pipes in each branch pipe), and then proceeds to step 7.
(I) advantageous effects
The technical scheme of the invention has the following advantages: the invention is based on the real-time cooling water circulating pump, the running state and frequency of each cooling tower and the pressure P of the cooling water main water supply pipe of the cooling tower groupGWater supply pressure (P) of cooling water branch pipe of cooling tower setG-1、PG-2、……、PG-mWhere m represents the total number of cooling tower bank branches), the pressure of the water supply branch pipe (P) of each cooling tower1-1、P1-2、……、P1-n、……、Pm-1、Pm-2、……、Pm-nWherein m represents the total number of branch pipes of the cooling tower group, n represents the total number of branch pipes of the cooling water supply in each branch pipe) and the like, and analyzing the difference delta P (namely P) between the pressure of the water distribution branch pipe of each cooling tower and the pressure of the cooling water main supply pipe of the cooling tower groupGAnd Pm-nThe difference), comparing the data of the state storage database, adjusting the opening of the electric regulating valve by a proportional integral derivative method, and then carrying out data acquisition and unbalance rate calculation to circulate until the unbalance rate reaches a preset target. The hydraulic balance requirement among the cooling tower water distribution branches on the premise that the cooling tower in each operation adapts to the dynamic operation of the system is guaranteed, the system energy efficiency and the equipment operation efficiency are effectively reduced and improved, and a good energy-saving effect is obtained.
The data stored in the system can be exported for basic research, and meanwhile, the system can be interacted with the existing building control system in a data layer and a control layer.
In addition to the technical problems addressed by the invention, the technical features constituting the solutions, and the advantages brought by the technical characteristics of these solutions, described above, other technical features of the invention and the advantages brought by these technical features,
drawings
The invention is further illustrated by the following examples and figures:
FIG. 1 is a flow chart of a dynamic hydraulic balance adjustment method for a cooling tower assembly according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a dynamic hydraulic balance adjustment system for a cooling tower assembly according to a second embodiment of the present invention;
fig. 3 is a power supply schematic diagram of a dynamic cooling tower group hydraulic balance adjustment system structure according to the present invention.
In the figure: 1: a pressure sensor; 2: a cooling tower water supply branch pipe; 3: a cooling tower; 4: an electric control valve; 5: a manual regulating valve; 6: a cooling tower group water supply main pipe; 7: a cooling tower group backwater main pipe; 8: a cooling tower group water supply main pipe; 9: a cooling tower group water return main pipe; 10: a cooling tower return water branch pipe; 11: a collector; 12: an actuator; 13: a memory; 14: an input device; 15: a display; 16: building control system interface; 17: a processor; 18: an expansion interface; 19: a communication line; 20: a control line; 21: a cooling tower running state acquisition line; 22: a power line.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that unless otherwise explicitly specified or limited, the terms "mounted," "connected," and the like are used in a broad sense, and those skilled in the art can understand the specific meaning of the terms in the present invention according to specific situations.
In addition, in the description of the present invention, "a plurality", and "a plurality" mean two or more unless otherwise specified.
Example 1
As shown in fig. 1, a dynamic hydraulic balance adjustment method for a cooling tower group according to an embodiment of the present invention includes the following steps.
Cooling tower operating conditions and operating frequency (f)1-1、f1-2、……f1-n、……、fm-1、fm-2、……、fm-nWherein m represents the total number of branch pipes of the cooling tower group, n represents the total number of branch pipes of the cooling water supply in each branch pipe, the operation state and the operation frequency of the cooling water circulation pump (f)1、f2、……、fNWhere N represents the total number of water pumps), and the pressure P of the cooling water main water supply pipe of the cooling tower groupGWater supply pressure (P) of cooling water branch pipe of cooling tower setG-1、PG-2、……PG-mWhere m represents the total number of cooling tower bank branches), the pressure of the water supply branch pipe (P) of each cooling tower1-1、P1-2、……、P1-n、……、Pm-1、Pm-2、……、Pm-nWhere m represents the total number of cooling tower group branch pipes and n represents the total number of cooling water supply branch pipes in each branch pipe).
According to the running states and frequencies of the equipment such as the real-time cooling water circulating pump, the cooling tower and the like and the pressure P of the cooling water main water supply pipe of the cooling tower group collected in the step 1GAnd the cooling tower group cooling water branch pipe water supply pressure (P)G-1、PG-2、……、PG-mWhere m represents the total number of cooling tower group branches), the pressure of each cooling tower water supply branch pipe (P)1-1、P1-2、……、P1-n、……Pm-1、Pm-2、……、Pm-nWherein m represents the total number of branch pipes of the cooling tower group, and n represents the total number of cooling water supply branch pipes in each branch pipe), and inquiring the opening data of the electric control valve corresponding to the data strip in the database.
According to the step 2, the corresponding opening data (V) of each electric control valve in the database under the condition that the parameters are matched are compared1-1、V1-2、……、V1-n、……、Vm-1、Vm-2、……、Vm-nWhere m represents the total number of cooling tower group branch pipes and n represents the total number of cooling water supply branch pipes in each branch pipe), if data are availableAnd 4, if the library has corresponding matching, performing step 4, and otherwise, performing step 15.
And (4) driving the regulating valve to a corresponding position according to the opening value of the regulating valve found in the step (3).
After the regulating valve acts, the pressure of the pipeline changes, and at the moment, the pressure P of the main cooling water supply pipe of the cooling tower group is controlledGWater supply pressure (P) of cooling water branch pipe of cooling tower setG-1、PG-2、……、PG-mWhere m represents the total number of cooling tower bank branches), the pressure of the water supply branch pipe (P) of each cooling tower1-1、P1-2、……、P1-n、……、Pm-1、Pm-2、……、Pm-nWhere m represents the total number of branch pipes of the cooling tower group, and n represents the total number of branch pipes of the cooling water supply in each branch pipe).
Performing specific analysis on the pressure data acquired in the step 5, and calculating the difference delta P (namely P) between the pressure of each cooling tower water distribution branch pipe and the pressure of the cooling tower group water supply main pipeGAnd Pm-nThe difference of (d).
Obtaining the minimum delta P according to the (m x n) delta Ps calculated in the step 6minThen, the measured values are compared with (m × n-1) Δ P to calculate respective imbalance ratios P% (. DELTA.P-. DELTA.P)min)/△Pmin100%) where the minimum imbalance is PminWhen-10% is less than or equal to PminAnd (5) when the percentage is less than or equal to 10%, performing the step 8, otherwise, performing the step 9.
And (2) storing data such as the current equipment running state, frequency, pipeline pressure, opening degree of an adjusting valve and the like into a state storage database, and starting the next cycle from the step 1 to ensure that the hydraulic balance requirement under dynamic change can be met in real time.
The calculation result of the step 7 is that the absolute values of the unbalance rates are all larger than 10% ", and the calculation result delta P in the step 6 is used as the basisminAnd judging the opening V of the regulating valve on the water distribution branch pipe of the cooling tower corresponding to the pressure differencem-nIf the valve opening is 100%, step 13 is performed, otherwise step 10 is performed.
According to the calculated delta P in step 6min，And opening the regulating valve corresponding to the corresponding cooling tower water distribution branch pipe to 100 percent of opening.
After step 10, collecting the pressure P of the cooling water main water supply pipe of the cooling tower group of the pipelineGWater supply pressure (P) of cooling water branch pipe of cooling tower setG-1、PG-2、……、PG-mWhere m represents the total number of cooling tower bank branches), the pressure of the water supply branch pipe (P) of each cooling tower1-1、P1-2、……、P1-n、……、Pm-1、Pm-2、……、Pm-nWhere m represents the total number of cooling tower group branch pipes and n represents the total number of cooling water supply branch pipes in each branch pipe).
Calculating the difference delta P (namely P) between the pressure of the water distribution branch pipe of each cooling tower and the pressure of the water supply main pipe of the cooling tower group according to the data collected in the step 11GAnd Pm-nThe difference of (d).
Finding out the delta P according to the delta P calculated in step 6 or step 12minAnd based on the data, PID (proportion integration differentiation) adjustment is carried out on the electric control valves of the rest of the water distribution branch pipelines (the electric control valves corresponding to the cooling tower in use), and the opening value required to be adjusted of each control valve is calculated.
And (4) performing corresponding action of the electric regulating valve according to the opening of the electric regulating valve calculated in the step (13), entering a step (5) after the action is completed, entering the next circulation process until a preset unbalance rate is reached, and storing the state data at the moment into a state storage database.
After the judgment result in the step 3 is 'no matching item', the step is started, and the pressure P of the cooling tower group cooling water main water supply pipe of the pipeline is collectedGWater supply pressure (P) of cooling water branch pipe of cooling tower setG-1、PG-2、……、PG-mWhere m represents the total number of cooling tower bank branches), the pressure of the water supply branch pipe (P) of each cooling tower1-1、P1-2、……、P1-n、……、Pm-1、Pm-2、……、Pm-nWhere m denotes the total number of cooling tower group branch pipes and n denotes the total number of cooling water supply branch pipes in each branch pipe), and then proceeds to step 7. The invention uses the pressure P of the cooling water main water supply pipe of the cooling tower groupGWater supply pressure (P) of cooling water branch pipe of cooling tower setG-1、PG-2、……、PG-mWhere m represents the total number of cooling tower bank branches), the pressure of the water supply branch pipe (P) of each cooling tower1-1、P1-2、……、P1-n、……、Pm-1、Pm-2、……、Pm-nWherein m represents the total number of branch pipes of the cooling tower group, n represents the total number of branch pipes of the cooling water supply in each branch pipe), the running state of the equipment, the state and the opening degree of the electric regulating valve are collected and analyzed in real time, and then the opening degree of the electric regulating valve is regulated according to the analysis result, so that the method for keeping the pressure difference value between the main water supply pipe and each branch pipe of the cooling tower within a certain unbalance rate range is achieved, the aim of dynamically regulating the hydraulic balance of the cooling tower is fulfilled, the running efficiency of the equipment is improved, the energy consumption of the system is effectively reduced, and a good energy-saving effect is achieved. Meanwhile, data such as the state of each device, the opening of the electric regulating valve, the pressure of the pipeline and the like in the balanced state are stored, so that the aim of quick calling in the same running state in the future can be fulfilled, and the time for the system to reach the balanced state is shortened.
Example 2
As shown in fig. 2, a dynamic hydraulic balance adjustment system for a cooling tower group comprises a cooling tower group water supply main pipe 6, a cooling tower group water return main pipe 7, a plurality of cooling tower group water supply main pipes 8, a cooling tower group water return main pipe 9, a pressure sensor 1 arranged on a water supply loop, a plurality of cooling tower branch pipe water supplies 2 and a cooling tower water return branch pipe 10; a plurality of cooling tower branch pipe water supplies 2 and cooling tower return branch pipes 10 are branched from a cooling tower group water supply header pipe 6 and a cooling tower group return header pipe 7 to form branches which are connected with a cooling tower 3, and a pressure sensor 1, an electric regulating valve 4 and a manual regulating valve 5 are arranged on a cooling tower branch pipe water supply loop; all pressure sensors 1, opening data of an electric control valve 4, running state data of a cooling tower 3 and other data in the system are connected to a collector 11 through a communication line 19, wherein control signals of the electric control valve 4 are connected to an actuator 12 through a running state collecting line 21 and a control line 20 of the cooling tower; the data collected by the processor 17 are analyzed and processed, and the process parameters and result parameters are stored in the memory 13.
The processor 17 comprises a building control system interface and external interface 16, and the building control system interface and external interface 16 is used for performing interactive use of data and control levels on building control data and data of the processor 17.
Example 3
As shown in fig. 3, the present invention further includes an expansion interface 18, and the processor 17 is electrically connected to the expansion interface 18 for future upgrade and reconstruction of the system.
The functions of system setting, status display and the like are remotely programmed via the external display 15 to the external display 15 and the input device 14, and the input device 14 is a wireless or wired device.
The system collector 11, the actuator 12, the memory 13, the external display 15, the external interface 16 such as a building control system interface, the processor 17 and the expansion interface 18 provide power supply through a power line 21.
The invention uses the pressure P of the cooling water main water supply pipe of the cooling tower groupGWater supply pressure (P) of cooling water branch pipe of cooling tower setG-1、PG-2、……、PG-mWhere m represents the total number of cooling tower bank branches), the pressure of the water supply branch pipe (P) of each cooling tower1-1、P1-2、……、P1-n、……、Pm-1、Pm-2、……、Pm-nWherein m represents the total number of branch pipes of the cooling tower group, n represents the total number of branch pipes of the cooling water supply in each branch pipe), the running state of the equipment, the state and the opening degree of the electric regulating valve are collected and analyzed in real time, and then the opening degree of the electric regulating valve is regulated according to the analysis result, so that the method for keeping the pressure difference value between the main water supply pipe and each branch pipe of the cooling tower within a certain unbalance rate range is achieved, the aim of dynamically regulating the hydraulic balance of the cooling tower is fulfilled, the running efficiency of the equipment is improved, the energy consumption of the system is effectively reduced, and a good energy-saving effect is achieved. Meanwhile, data such as the state of each device, the opening of the electric regulating valve, the pressure of the pipeline and the like in the balanced state are stored, so that the aim of quick calling in the same running state in the future can be fulfilled, and the time for the system to reach the balanced state is shortened.
The invention provides a power supply system schematic diagram of each component of a dynamic hydraulic balance adjusting system for a cooling tower group, and a power supply 14 provides power guarantee for an acquisition device 11, an actuator 12, a storage device 13, an external display 15, an external interface 16 such as a building control system interface and the like, a processor 17 and an expansion interface 18.
Claims (10)
1. A dynamic hydraulic balance adjusting method for a cooling tower group is characterized by comprising the following steps: at least comprises the following steps:
step 1, collecting the following information
Collecting the running state and the running frequency of the cooling tower;
the running state and running frequency of the cooling water circulating pump;
pressure P of cooling water main water supply pipe of cooling tower groupG；
Water supply pressure P of cooling water branch pipe of cooling tower setG-m；
Pressure P of water supply branch pipe of each cooling towerm-n；
Step 2, reading the state storage database "
Inquiring the opening data V of the electric control valve corresponding to the data strip in the database according to the information acquired in the step 1m-n；
Step 3, comparing states
According to the step 2, opening data V of each corresponding electric control valve in the database under the condition that the parameters are matched are comparedm-nIf the database has the corresponding matching condition, performing the step 4, otherwise, performing the step 15;
step 4, adjusting the action of the butterfly valve
According to the opening value V of the regulating valve found in the step 3m-nDriving the regulating valve to a corresponding position;
step 5, data acquisition
After the regulating valve acts, the pressure of the pipeline changes, and at the moment, the pressure P of the main cooling water supply pipe of the cooling tower group is controlledGWater supply pressure P of cooling water branch pipe of cooling tower setG-mPressure P of water supply branch pipe of each cooling towerm-nCollecting data;
step 6, data processing
Analyzing the pressure data collected in the step 5, and calculating the pressure P of the water supply main pipe of the cooling tower groupGDistributing water branch pressure P to each cooling towerm-nThe difference Δ P of;
step 7, calculating the unbalance rate
Obtaining the minimum delta P according to the (m x n) delta Ps calculated in the step 6minThen, the measured values are compared with (m × n-1) Δ P to calculate respective imbalance ratios P% (. DELTA.P-. DELTA.P)min)/△Pmin100%) where the minimum imbalance is PminWhen-10% is less than or equal to PminWhen the percentage is less than or equal to 10 percent, performing the step 8, otherwise, performing the step 9;
step 8, state store writes to the "state store database"
Storing data such as the current equipment running state, frequency, pipeline pressure, opening degree of an adjusting valve and the like into a state storage database, and then starting from the step 1 to perform next cycle so as to ensure that the hydraulic balance requirement under dynamic change can be met in real time;
step 9, judging the opening degree of the minimum differential pressure valve
When the calculation result of the step 7 is that the absolute value of the unbalance rate is more than 10 percent, and the steps are carried out according to theThe result of calculation Δ P in step 6minAnd judging the opening V of the regulating valve on the water distribution branch pipe of the cooling tower corresponding to the pressure differencem-nIf the valve opening is 100%, performing step 13, otherwise performing step 10;
step 10, valve opening pretreatment
According to the calculated delta P in step 6min，Adjusting the opening degree of an adjusting valve corresponding to the corresponding cooling tower water distribution branch pipe to 100%;
step 11, data acquisition
After step 10, collecting the pressure P of the cooling water main water supply pipe of the cooling tower group of the pipelineGWater supply pressure P of cooling water branch pipe of cooling tower setG-mPressure P of water supply branch pipe of each cooling towerm-n；
Step 12, data processing
Calculating the pressure P of the water supply main pipe of the cooling tower group according to the data collected in the step 11GDistributing water branch pressure P to each cooling towerm-nThe difference Δ P of;
step 13, calculating the opening of the regulating valve
Finding DeltaP from the DeltaP calculated in step 12minBased on the data, carrying out PID adjustment on the electric control valves of the rest water distribution branch pipelines, and calculating the opening value of each control valve to be adjusted;
step 14, adjusting the butterfly valve action
Performing corresponding action of the electric regulating valve according to the opening of the electric regulating valve calculated in the step 13, entering a step 5 after the action is completed, entering the next circulation process until a preset unbalance rate is reached, and storing the state data at the moment into a state storage database;
step 15, data processing
After the judgment result in the step 3 is 'no matching item', the step is entered, and the pressure P of the water supply main pipe of the cooling tower group is calculated according to the data collected in the step 1GDistributing water branch pressure P to each cooling towerm-nAnd then proceeds to step 7.
2. According to the claimsThe method for dynamically adjusting the hydraulic balance of the cooling tower group disclosed in claim 1 is characterized in that: the step 3 of state comparison comprises the following steps: cooling water circulating pump, running state and running frequency of cooling tower, and pressure P of cooling water main water supply pipe of cooling tower groupGWater supply pressure P of cooling water branch pipe of cooling tower setG-mPressure P of water supply branch pipe of each cooling towerm-nIf the same state exists in the database, the corresponding opening value of the electric control valve in the state in the database is directly called.
3. The dynamic hydraulic balance adjustment method for the cooling tower group according to claim 1, wherein: the permanent storage of the data in the "state storage database" in the step 2 refers to the setting until the next initialization.
4. The dynamic hydraulic balance adjustment method for the cooling tower group according to claim 1, wherein: in the calculation of the unbalance rate stated in the step 7, the unbalance rate deviation is defaulted to 10%, and the unbalance rate deviation can be adjusted on an external display or a background through the authority of an administrator.
5. The dynamic hydraulic balance adjustment method for the cooling tower group according to claim 1, wherein: the opening degree of the electric valve declared in the step 9 is default to 100%, and can be adjusted on an external display or a background through the authority of an administrator.
6. The dynamic hydraulic balance adjustment method for the cooling tower group according to claim 1, wherein: the stated 'pressure' data stored in the database in step 8 comprises the pressure P of the cooling tower group cooling water main water supply pipeGWater supply pressure P of cooling water branch pipe of cooling tower setG-mPressure P of water supply branch pipe of each cooling towerm-n。
7. The dynamic hydraulic balance adjustment method for the cooling tower group according to claim 1, wherein: said statement Δ in step 9PminOne water distribution branch pipe of the corresponding cooling tower can exist, and a plurality of water distribution branch pipes can exist due to construction installation, measurement accuracy and the like.
8. The dynamic hydraulic balance adjustment method for the cooling tower group according to claim 1, wherein: the information collected in the step 1 is the pressure parameter of the branch water distribution pipeline corresponding to the started cooling tower.
9. A dynamic hydraulic balance adjusting system for a cooling tower group is characterized in that: the system comprises a cooling tower group water supply main pipe (6), a cooling tower group water return main pipe (7), a plurality of cooling tower group water supply main pipes (8), a cooling tower group water return main pipe (9), a pressure sensor (1) arranged on a water supply loop, a plurality of cooling tower branch pipe water supplies (2) and a cooling tower water return branch pipe (10); a plurality of cooling tower branch pipe water supplies (2) and cooling tower return branch pipes (10) are divided from a cooling tower group water supply main pipe (6) and a cooling tower group return main pipe (7) to form branches which are connected with a cooling tower (3), and a pressure sensor (1), an electric regulating valve (4) and a manual regulating valve (5) are arranged on a cooling tower branch pipe water supply loop; in the system, all pressure sensors (1), opening data of an electric control valve (4), running state data of a cooling tower (3) and the like are connected to a collector (11) through communication lines (19), wherein control signals of the electric control valve (4) are connected to an actuator (12) through a cooling tower running state collection line (21) and a control line (20); the data collected by the processor (17) are analyzed and processed, and the process parameters and the result parameters are stored on the memory (13).
10. The dynamic cooling tower hydraulic balance adjustment system of claim 9, wherein: the processor (17) comprises a building control system interface and an external interface (16), and the building control system interface and the external interface (16) are used for carrying out interactive use of data and a control layer on the building control data and the data of the processor (17); the system further comprises an expansion interface (18), and the processor (17) is electrically connected with the expansion interface (18) for future upgrading and rebuilding of the system.
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